|
The pressure and temperature limits within which pipes,
tees, branches, etc., shall be used, shall be in accordance
with Table 2.
TABLE 2
Maximum permissible working pressure and temperature
| Material
|
Method of
manufacture |
Maximum permissible
working pressure |
Maximum
permissible temperature |
Form |
| °C |
°F |
|
| Carbon steel |
Cold drawn seamless |
No restriction |
454 |
850 |
Straights, bends or fittings. |
| Hot finished seamless |
Do |
454 |
850 |
Do |
| Butt welded [Max. nominal
bore allowable 102 mm. (4 in)] |
21 kg/cm²
(300 lb./sq. in.) |
260 |
500 |
Do |
| Electric resistance welded
|
No restriction |
454 |
850 |
Straights |
| Cast steel |
Castings |
No restriction |
454 |
850 |
Straights, bends or fittings |
| Molybdenum steel |
Cold drawn seamless and
castings. |
No restriction |
524 |
975 |
Do |
| Chromium molybdenum Steel |
Cold drawn seamless and
hot finished seamless |
No restriction |
621 |
1150 |
Do |
| Copper |
Solid drawn up to and
including 127 mm.(5 in.) dia. |
12.6 kg/cm² (180
lbs./sq.in.) |
Not allowed
for superheated steam |
Straights and bends. |
|
